Garry's Mod server list wont load!

I recently built a gaming PC and after installing GMod, I found that the server list wont load.
I still have the servers from my history and favourites from my old PC, but I can’t load the actual server list.
If it helps I have been portforwarding a Minecraft server and a Terraria server on my router.
Also, I think I’m having the same problem on Shattered Horizon… I have looked for answers but I can’t find anything.
Please Help!
[EDIT]
It’s ok, I got some help and it’s been fixed!
If you have the same problem, then following the instructions in the greenbox on this page:

should work… It did for me!